The following is the e-mail response from Au Bon Pain when asked which of their menu items are vegan:
Thank you for your email.
Au Bon Pain labels any vegan item on their website and menu boards.
Our hearth breads, soft breads and rolls do not contain L-Cysteine
Regular bagels do contain L-Cysteine, derived from animal source
Skinny bagels, tortilla wraps and lavash do contain L-Cysteine, not
derived from animal source